Patch author:  Mike A. Harris <mharris@redhat.com>

This patch adds a new option to the Radeon driver named "ForceLegacyCRT",
which allows the user to force the driver to use a legacy VGA CRT display
when no monitor is detected.  Very old monitors can then be used with
Radeon hardware.

Fixes bug report/feature request:
        http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=69978

Submitted patch upstream during post 6.7.0 development:
        http://freedesktop.org/bugzilla/show_bug.cgi?id=871


--- xc/programs/Xserver/hw/xfree86/drivers/ati/radeon_driver.c.ati-radeon-forcelegacycrt	2004-07-09 17:58:52.000000000 -0400
+++ xc/programs/Xserver/hw/xfree86/drivers/ati/radeon_driver.c	2004-07-15 03:15:16.000000000 -0400
@@ -160,7 +160,8 @@
     OPTION_RENDER_ACCEL,
     OPTION_SUBPIXEL_ORDER,
 #endif
-    OPTION_SHOWCACHE
+    OPTION_SHOWCACHE,
+    OPTION_FORCE_LEGACY_CRT
 } RADEONOpts;
 
 const OptionInfoRec RADEONOptions[] = {
@@ -204,6 +205,7 @@
     { OPTION_SUBPIXEL_ORDER, "SubPixelOrder",    OPTV_ANYSTR,  {0}, FALSE },
 #endif
     { OPTION_SHOWCACHE,      "ShowCache",        OPTV_BOOLEAN, {0}, FALSE },
+    { OPTION_FORCE_LEGACY_CRT, "ForceLegacyCRT",         OPTV_INTEGER, {0}, FALSE },
     { -1,                    NULL,               OPTV_NONE,    {0}, FALSE }
 };
 
@@ -932,7 +934,21 @@
 	    if (INREG(RADEON_LVDS_GEN_CNTL) & RADEON_LVDS_ON) MonType = MT_LCD;
 	    else MonType = MT_DFP;
 	} else MonType = MT_CRT;
-    } else MonType = MT_NONE;
+    } else if (xf86ReturnOptValBool(info->Options,
+                                    OPTION_FORCE_LEGACY_CRT, FALSE)) {
+        /* If no monitor/LCD type detected so far, we test for option
+	 * ForceLegacyCRT, and if present, we force-enable CRT for this head.
+	 * Option added for Alan Cox's ancient mono VGA monitor:
+	 * http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=69978
+	 */
+	MonType = MT_CRT;
+        xf86DrvMsg(pScrn->scrnIndex, X_INFO,
+		   "Using option ForceLegacyCRT from config file to allow a single legacy\n\t"
+		   "VGA CRT to be used.  Do NOT attach a second display to the other head\n\t"
+		   "or damage may result.\n");
+    } else {
+	MonType = MT_NONE;
+    }
 
     info->DDCReg = DDCReg;
 
--- xc/programs/Xserver/hw/xfree86/drivers/ati/radeon.man.ati-radeon-forcelegacycrt	2004-06-20 03:26:08.000000000 -0400
+++ xc/programs/Xserver/hw/xfree86/drivers/ati/radeon.man	2004-07-15 03:17:15.000000000 -0400
@@ -419,6 +419,14 @@
 Enable page flipping for 3D acceleration. This will increase performance
 but not work correctly in some rare cases, hence the default is
 .B off.
+.TP
+.BI "Option \*qForceLegacyCRT\*q \*q" boolean \*q
+Enable usage of legacy VGA CRT display when no monitor is detected.  This
+can be used to force the driver to work with ancient VGA monitors, such as
+an old mono VGA monitor.  *WARNING* Do NOT use this option with dualhead
+configurations with both heads connected to a dualhead Radeon card, as it
+can potentially damage the monitor.
+.B off.
 .br
 .B Note:
 Page flipping does not work well in certain configurations with MergedFB.  If you